Research Journal of Science and Technology

The fish assemblage and some ecological variables for Shatt Al-Arab Riverin Abi Al-Khasib area near the port of Abu Flus, during 2016 and 2017 was used to assess the effect of environmental conditions on seasonal variations in fish species abundance and distribution patterns. A total 1531 fishes belonging to 28 species and 12 families, of, including 16 freshwater, 12 marine species, 8 native fish and 8 alien fish. Cyprinidae the dominant family, was represented by eleven species. Coptodon. zilliwas the most abundant species numerically comprising 23.2%, followed by Carassius. auratus (14%), Liz. subviridis (11%), Planilizaabu (10%), Tenualosailisha (9%) and Acanthopagrusarabica (8%). The recorded salinity mean was 1.7‰. Numerical diversity index 2.605–2.18, evenness index were (0.83–0.686) and richness were 1.546–0.950.